Fastener



FIG. 1 is an isometric view of a front, top, and right side of an ornamental design for a fastener;

FIG. 2 is an isometric view of a front, bottom, and right side of the fastener of FIG. 1;

FIG. 3 is a front elevational view of the fastener of FIG. 1;

FIG. 4 is a rear elevational view of the fastener of FIG. 1;

FIG. 5 is a right side elevational view of the fastener of FIG. 1;

FIG. 6 is a left side elevational view of the fastener of FIG. 1;

FIG. 7 is a top plan view of the fastener of FIG. 1; and,

FIG. 8 is a bottom plan view of the fastener of FIG. 1.

The broken lines in the drawings illustrate portions of the fastener and form no part of the claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 